Tempered heat transfer system

In this chapter in Section 3.1 we consider mechanical drives. In Sections 3.2 and 3.3 furnaces and exchangers, condensers and reboUers are considered followed by fluidized bed with coil in the bed, Section 3.4 and static mixers. Section 3.5. Direct contact systems are considered next liquid-liquid. Section 3.6 gas-liquid cooling towers. Section 3.7 gas-liquid quenchers. Section 3.8 gas-liquid condensers. Section 3.9, and gas-gas thermal wheels. Section 3.10. Heat loss to the atmosphere is described in Section 3.11. Refrigeration, steam generation and high temperature heat transfer fluids are presented in Sections 3.12 to 3.14, respectively. Tempered heat exchange systems are considered in Section 3.15. 

Limit temperature of heating medium Use split heating/cooling system to eliminate heat transfer to unwetted surface Heat with sparged steam/tempered water Avoid splashing of material onto unwetted heating surface... 

The remaining uncondensed NH3 and CO leaving the shell side of the evaporator are sent to a MP carbamate condenser. The heat released by condensation in this condenser is dissipated into a tempered cooling water system. This process forms MP carbamate that contains only 20 wt%-22 wt% water. The carbamate is transferred via a HP carbamate pump to the HP scrubber in the urea synthesis section. The urea solution leaving the adiabatic CO stripper and the HP stripper are expanded together in the LP recirculation section. 

In a reversible process, all heat transfer takes place without a temperature drop. The prerequisite for a heat flow into or out of a system is always a temperature drop in the direction of transfer. The greater the temper-... 

The heat pipe (the operating principle is shown in Figure 2.92) is a self-contained system that uses the evaporation of a volatile liquid to transport heat. In this case, heat can be transported only by the evaporation/condensation process over the length of the pipe. Heat is only dissipated if the cold end of the pipe is cooled by a temperature control channel. The heat pipe is ideal for all the other places where temperature control channels cannot be directly accessed. Using the compact heat pipes, heat can be removed locally and can then be transferred to a geometrically favorable position. The heat pipe is therefore also suitable for tempering of slender cores and other inaccessible areas. 

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